ICEBlock is an iOS app that lets users anonymously pin ICE agent sightings on a map and receive alerts within a five-mile radius.
Criticism by US government officials and CNN coverage led to a surge in downloads, making it the top free social networking app in the US.
Officials, including the White House press secretary, ICE acting director, and attorney general, claim the app endangers officers and are considering legal action against the developer.
The app does not collect personal data like device IDs or IP addresses and is only available on iOS to protect user privacy.
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